Key ideas
- Structured data helps search engines understand predictable information on a page.
- Schema.org provides common vocabularies for marking up entities and content types.
- Testing tools help confirm that markup is valid before a page is published.
Context
A beginner-friendly introduction to structured data, schema vocabulary, testing, and search visibility. The article belongs to The Modern Web's practical collection for developers, designers, and site owners who want clear, usable guidance.